Better Edge Backup v5.2
User Guide
Copyright © 2008, Better Edge Technology, Inc. All Rights Reserved.
Page 58 of 121 (September 16, 2008)
Delta Ratio
The [Delta Ratio] setting is defined to b e the size of a delta file divided by the size of its full backup file (i.e. the
percentage of changes detected between t he last full backup file and the current file).
If the delta ratio calculated from the size of the generated delta file and the size of the full backup file is g reater
than the [Delta Ratio] setting, the whole fi le, instead of just the delta f ile, will be backed up to the backup server.
It is done this way because the difference b etween backing up the whole file and the de lta file is not significant
and it is better to upload the whole file inste ad to reduce the time required to restore the file.
The default setting of [Delta Ratio] is 50%. This means that if a file changes by more than 50%, the whole file,
instead of just the delta file, will be backed up and uploaded to the backup server.
8.5 Advanced In-file delta type
The [In-file delta] -> [Ad vanced] setting allows users to override default in-file delta type when on a certain
number of days (e.g. al l Sundays or the 1
st
day of each month). This is useful if you want a ll in-file delta backups
to be incremental but you want to do a diffe rential in-file delta backup on Saturdays as well as the f ull file backups
on the 1
st
day of every month. If you want to do this, simply configure [In-file delta] -> [Advanced] -> [Advanced
In-file Delta Type Setting] to what is shown below.
With this setting, all backup Jobs on Saturdays will be differential in-file delta backups, backups for the 1
st
day of
each month will run a full backup. This ensures that all b ackup files will be backed up in fu ll at a regular interv al.
One benefit of this is that restore time will run faster because of less d elta merging. An other benefit is that the
risk of a corrupted incremental delta file resulting in da ta loss is much lower because a f ull backup is always
available periodically.